Sliding moulds with walls of sheet metal



May 12, 1959 2,885,762

SLIDING MOULDS WITH WALLS OF SHEET METAL Filed Nov. 16, 1955 I R. G. JOHANSSON 2 Sheet s-She et 1 ay 12, 1959 R. G. JOHANSSON 2,885,762

SLIDING MOULDS WITH WALLS OF SHEET METAL Filed Nov. 16, 1955 2 Sheets-Sheet 2 FIG.4

FIGS

United States Patent v Ce SLIDING MOULDS WITH WALLS OF SHEET METAL Rolf Gustaf Johansson, Saltsjo-Duvnas, Sweden Application November 16, 1955, Serial No. 547,164 Claims priority, application Sweden November 19, 1954 4 Claims. (Cl. 25-131) This invention relates to a sliding mould with walls of sheet metal, to be used instead of the usual wooden mould, whereby the resistivity of the mould to destruction through friction against the concrete is doubled many times over. That which particularly characterizes this sliding mould is that the mould sheet is rigid in the vertical plane but mouldable in the horizontal plane.

Sliding moulds for forming concrete objects are a relatively modern development in the concrete masonry art. Sliding moulds are generally of the type having a supporting frame provided for the mould sides which are adapted to be progressively moved upwardly as the wall or concrete surface is progressively formed. The sliding type of mould is thus distinguishable from the stationary type of mould in that in the latter type of mould the forms remain in the same place until the concrete has become quite hard whereupon the forms are opened and removed from the finished wall.

The demands which may be made upon the mouldable parts of a sliding mould can be summed up as per the following:

(1) The mould must give the concrete an even and smooth surface.

(2) The mould must have a smooth inner surface, so that a low friction coefiicient is obtained.

(3) The mould must have a great resistivity to wear through friction.

(4) The mould shall, without injurious deformation, be able to absorb the stresses arising during the casting.

(5) It must be easy to mount and dismount the mould.

(6) It must be easy to clean the mould.

(7) The mould must be resistive to damages afiicted during transportation.

(8) In view of transportation the mould must not be bulky.

The abovementioned demands are fulfilled by this invention, and they are particularly considered in the embodiment in the accompanying drawing which shows a construction, which, besides fulfilling the abovementioned desires, shows a universal mould in the sense that the mould sheets, due to their flexibility in the horizontal plane, can be used for casting plain as well as arched walls. By a standardized system of modulation the mould sheets can be connected so that any desired length can be obtained.

With regard to the constructive formation of the mould sheets a great stress is laid upon the fact that the said sheets, when stored and transported, can be piled upon each other, so that as little space as possible is required, at the same time as they are well protected from mechanical damage.

In the accompanying drawing Fig. 1 shows a part of the mould from the side, Fig. 2 shows the same part from above, Fig. 3 shows an arcuate part of the mould, Figs. 4 and 5 show, on a larger scale, a mould wall of sheet metal, seen in plan view and towards the edge respectively, Fig. 6 is a diagrammatical end view of the 2,885,762 Patented May 12, 1959.

sliding mould, and Figs. 7 and 8 show details, the latter figure being approximately in full size.

Referring now to the drawings 1 designates the mould walls of sheet metal, 2 and 13 designate mould bands which may be straight or arcuate and may be made of wood or iron. Reference numeral 3 designates vertical stiffening bars or irons which have angular profile and extend to the full height of the sheets, angle irons 4 and 5 being attached to the said stiffening irons. A yoke, well known from earlier constructions, consists of a transverse piece 6 and arms 7, each of the latter resting against its respective mould wall as will be seen from Fig. 6. The arms .7 are at. 7a provided with a carrying surface each for the mould walls. The mouldwalls, which are of comparatively thin sheet metal are along two sides bent at an angle of 45. The bending is distinctly shown in Figs. 5, 7, and 8.

Two or more mould bands 2 or 13 are connected to each other by means of spacers 7b, the lower band being attached to the carrying surface 7a. The mould sheets are suspended in or attached to the upper mould band 13 or 2 by means of the stiffening irons 3 and the angle irons 4 and 5, nails being driven into the holes 8 In Fig. 6 the lefthand half of the mould has bands 2 of wood and the righthand half bands 13 of iron.

In order to facilitate assemblage and in order to absorb vertical forces from the mould sheets, the vertical stiffening irons, particularly in the joints between two sheets, are provided with a transverse support iron 12 at the lower end.

The distance between the stiifening irons 3 varies and is considered in view of the pressure of the concrete and the moment of resistance of the mould sheets. The stiffening irons 3, as shown in the drawing, can be similar between themselves, but where the sheets are joined special joint irons 9 are provided. These are shown in Fig. 7 as triangular and can be locked by means of screws 10 and nuts 11 so that the bent edge portions 1a of the sheets are clamped between the flanges of the stiffening irons 3 and joint bar or iron 9 (see the detail to the right in Fig. 7). The sides of the joint iron 9 resting against the sheet may be so cut, that the profile is nearly a T-profile, A joint-iron 9a with a marked such profile is shown in Fig. 8. Its web is fastened in a groove made in screw bolts 10 and its flanges are arranged to engage the bent edge portions 1a of the sheets.

The invention is not restricted to sliding moulds in which both sides are like. One side wall may even be permanent, it may for example be a rock wall to be cast-in.

Having now described my invention what I claim as new an desire to secure by Letters Patent is:

1. A sliding mold for casting concrete structures comprising a plurality of vertical substantially-rectangular metal sheets colinearly arranged end to end, said sheets having forward molding surfaces on one side thereof, the vertical edge portions of said sheets being bent rearwardly at acute angles away from the molding surfaces of said sheets, a vertical stiffening bar adjacent and on the rear side of each joint between the vertical edges of two adjacent sheets, each of said stiffening bars having a vertical angular-walled recess therein receiving the bent end portions of the associated pair of sheets, a vertical joint bar adjacent each of said vertical stiffening bars on the forward side of said metal sheets, said joint bar extending into the recess in the vertical stifiening bar and having surfaces thereon parallel with the wall surfaces of said stiffening bar recess and a molding surface coplanar with the forward molding surfaces of said sheets, and clamping means for securing each of said joint bars to its associated vertical stifiening bar to removably clamp the bent. edge portions of saidsheets intermediate said joint bar and said stiffening bar, whereby a smooth continuous forward molding surface is provided at each vertical jointjbetween adjacent sheets.

2, A sliding, mold as defined inclaim v1 whereinsaid vertical "metal "sheets are .fiexible ina horizontal direc-v tion and inflexible in a vertical direction, and ,further including horizontal beams connected to the vertical.

stiffening bars on the rear side of the moldjsheetsh 3; A sliding mold as defi'nedin claim 1 wherein each.

ofsaid,joint'bars'has a triangular cross sectionalcom figuration, the. hypotenuse of the triangle .being colinear with the forward molding surfaces of'said sheets. and

the. legs ofsaid triangle being parallel respectively to the'adjacentwalls ofthe recess of the associated vertical stiifeningb'ar;

4. Asliding moldiasdefined inclaim 1 whereinseach offs-aid ijoint bars; has 1 a- T-shaped profile in cross sec-.

4'? tion; the h'orizontalportiom of the 'F'being colinear with the forward molding surfaces of the sheets, the edges of the horizontal portion of the T being parallel respectively to the adjacent walls of the recess of the associated vertical stiffening bar.

References Citedinthefifile of this patent UNITED STATES PATENTS 

